JP5400660B2 - Light bulb-type lighting device and chromaticity correction method thereof - Google Patents

Description

  The present invention relates to a bulb-type illumination device that uses a light-emitting element and can replace a bulb, and a chromaticity correction method thereof.

  In recent years, in order to save energy and prevent global warming, lighting devices using LEDs (Light Emitting Diodes) capable of realizing higher energy efficiency than conventional incandescent bulbs have been researched and developed in the lighting field. For example, when an existing incandescent light bulb has an energy efficiency of several tens of [lm / W] when an LED is used as a light source (hereinafter, an illuminating device using the LED as a light bulb substitute is referred to as an “LED light bulb”). ), And energy efficiency of 100 [lm / W] or more.

  For example, Patent Literature 1 proposes an LED bulb that replaces a conventional incandescent bulb. In the LED bulb described in Patent Document 1, a light emitting module having a plurality of LED elements mounted on a substrate is placed on an end surface (front surface) of an outer shell member that internally includes a lighting circuit for lighting (emitting) the LED. The light emitting module is fixed and covered with a glove made of a translucent material (for example, glass). Since this LED bulb has an external shape close to that of a conventional incandescent bulb and has an E-type base as a power supply terminal, it can be attached to a socket of a lamp to which the conventional incandescent bulb is attached.

  By the way, in the light emitting module, for example, the composition of the LED element and the amount of the mixture of phosphors are adjusted according to the required chromaticity of illumination light. However, it is difficult to manufacture the same light emitting module that emits light of a desired chromaticity due to variations in the emission wavelength of the LED elements and variations in the amount of phosphor that is a mixture. This also causes variations in the chromaticity.

  Various methods are known as a method of correcting the chromaticity of the illumination light of the LED bulb. For example, in Patent Document 2, even if the light emission chromaticity of the LED element itself varies and deviates from a desired chromaticity such as white by using a filter, the light is corrected to the desired chromaticity and illuminated light. A chromaticity correction method used as the above has been proposed. Patent Documents 3 and 4 propose methods for correcting chromaticity by changing the material composition of the globe.

JP 2006-313718 A JP 2003-152227 A Special table 2009-516341 JP 2009-1441038 A

  However, since the method using the filter described in Patent Document 2 is intended to transmit or absorb a certain wavelength by the filter, the total luminous flux may decrease, and a sufficient amount of light cannot be guaranteed.

  Moreover, in the method of changing the material composition of the globe described in Patent Documents 3 and 4, the light transmittance in a specific wavelength range can be set to, for example, about 70% while maintaining high transmittance (about 90%). However, an additive to change the material composition of the glove is necessary, and this additive may change not only the optical properties but also the properties such as the glass strength and heat resistance, which is sufficient to affect the life. Reliability cannot be obtained.

  The present invention has been made in order to solve the above-mentioned problem, and can correct the chromaticity of the illumination light to the design value of the chromaticity of the illumination light of the lamp while suppressing the decrease in the total luminous flux, and the illumination light. A highly reliable bulb-type illumination device capable of making the chromaticity range smaller than the chromaticity range of illumination light of a conventional lamp and a chromaticity correction method therefor are provided.

The bulb-type lighting device of the present invention includes a light emitting module in which a plurality of light emitting elements are mounted on a substrate, and a globe made of a translucent material that covers the light emitting module, and the globe has a light transmittance of the globe. by adjusting a chromaticity of emission of the light emitting module, which corrects the design value of the chromaticity of the illumination light of the lamp, the chromaticity coordinates x of the light emission of the light emitting module, at least one of y is, When it is located on the minus side from the chromaticity coordinates x1, y1 of the design value of the illumination light of the lamp, the light transmittance of the globe is the thickness of the globe or the thickness of the diffusion film provided on the inner surface of the globe. By changing, it is 85% or more and substantially constant in the first visible light wavelength range that is the entire range of 380 nm or more and 490 nm or less, or a part thereof, 500 nm or more and 700 nm It is adjusted to be 90% or more and substantially constant in the second visible light wavelength range which is the entire range or a part of the following range, and the light transmittance in the first visible light wavelength range is adjusted. The difference between the average value and the average value of the light transmittance in the second visible light wavelength range is adjusted to be in the range of 2% to 12%.

The chromaticity correction method according to the present invention provides the chromaticity of illumination light of a light bulb-type lighting device including a light emitting module in which a plurality of light emitting elements are mounted on a substrate, and a globe made of a translucent material that covers the light emitting module. In the chromaticity correction method for correcting , when at least one of the chromaticity coordinates x and y of the light emission of the light emitting module is located on the minus side from the chromaticity coordinates x1 and y1 of the design value of the illumination light of the lamp , the light transmittance of the globe by varying the thickness of the diffusion film provided on the thickness or the inner surface of the glove of the glove, a first visible light is a whole range or a range of a portion of 380nm or more 490nm or less 85% or more in the wavelength range and substantially constant, and 90% or more in the second visible light wavelength range, which is the entire range of 500 nm to 700 nm and a part thereof. While being adjusted to be constant, a difference between the average value of the light transmittance in the first visible light wavelength range and the average value of the light transmittance in the second visible light wavelength range is 2% or more Adjustment is made to be within a range of 12% or less, and the chromaticity of the illumination light of the bulb-type illumination device is corrected to the design value of the chromaticity of the illumination light of the lamp.

  According to the present invention, the chromaticity of the illumination light can be corrected to the design value of the chromaticity of the illumination light of the lamp while suppressing the decrease in the total luminous flux, and the chromaticity range of the illumination light is adjusted to the illumination light of the conventional lamp. It is possible to provide a highly reliable bulb-type lighting device and a chromaticity correction method that can be made smaller than the chromaticity range.

It is sectional drawing which shows schematic structure of the lightbulb-type illuminating device of Embodiment 1 of this invention. It is sectional drawing which shows the detailed structure of the LED module in the lightbulb-shaped illuminating device of Embodiment 1 of this invention. It is a figure which shows chromaticity distribution of the illumination light of each LED bulb | ball formed by combining the same light emitting module and the globe from which light transmittance differs. It is a figure which shows the wavelength spectrum ratio of the light transmittance of each LED light bulb which combines the same light emitting module and the globe from which light transmittance differs. It is a figure which shows the relationship between the light transmittance of a glass globe, and a wavelength. It is a figure which shows chromaticity distribution of light emission of a some light emitting module. It is a figure which shows an example of the chromaticity range of the illumination light of the conventional LED bulb, and the chromaticity range of the illumination light of the LED bulb of the Example of this invention.

  The light bulb-type lighting device of the present invention includes a light-emitting module in which a plurality of light-emitting elements are mounted on a substrate, and a globe made of a translucent material that covers the light-emitting module. The globe corrects the chromaticity of the light emission of the light emitting module to the design value of the chromaticity of the illumination light of the lamp, and designs the chromaticity of the light emission of the light emitting module and the chromaticity of the illumination light of the lamp. When the values do not match, the light transmittance of the globe is 85% or more and substantially constant in the first visible wavelength range which is the entire range of 380 nm to 490 nm or a part thereof, and is 500 nm to 700 nm. It is adjusted to be 90% or more and substantially constant in the second visible light wavelength range which is the entire range or a part of the following range, and the light transmittance in the first visible light wavelength range is adjusted. The difference between the average value and the average value of the light transmittance in the second visible light wavelength range is adjusted to be in the range of 2% to 12%. As a result, the chromaticity of the illumination light can be corrected to the design value of the chromaticity of the lamp illumination light while suppressing the decrease in the total luminous flux, and the chromaticity range of the illumination light is adjusted to the chromaticity of the conventional lamp illumination light. A highly reliable bulb-type lighting device that can be made smaller than the range can be provided. The transmittance in the first visible light wavelength range is set to 85% or more, and the transmittance in the second visible light wavelength range is set to 90% or more. When the transmittance is smaller than these values, the luminous flux decreases. Because it is too much. More preferably, the light transmittance in the first visible light wavelength range is 90% or more, and the light transmittance in the second visible light wavelength range is 95% or more. In this case, the reduction rate of the total luminous flux can be further reduced, and the reliability can be further improved. Further, when the difference between the average value of the light transmittance in the first visible light wavelength range and the average value of the light transmittance in the second visible light wavelength range is smaller than 2%, the chromaticity range is effective. In addition, since the total luminous flux is excessively lowered when it is larger than 12%, it is necessary to be 2% or more and 12% or less.

  The chromaticity correction method of the present invention provides a chromaticity of illumination light of a light bulb-type illumination device comprising: a light-emitting module having a plurality of light-emitting elements mounted on a substrate; and a globe made of a translucent material that covers the light-emitting module. A chromaticity correction method for correcting, wherein when the chromaticity of light emission of the light emitting module does not coincide with a design value of chromaticity of illumination light of a lamp, a diffusion film provided on the thickness of the globe or the inner surface of the globe The light transmittance of the globe is adjusted by changing the thickness of the lamp, and the chromaticity of the illumination light of the bulb-type illumination device is corrected to the design value of the chromaticity of the illumination light of the lamp. Thereby, the chromaticity of the illumination light of the light bulb-type illumination device can be corrected to the design value of the chromaticity of the illumination light of the lamp without affecting the reliability.

  Hereinafter, the bulb-type lighting device and the chromaticity correction method of the present invention will be specifically described with reference to the drawings. However, the present invention is not limited thereto.

(Embodiment 1)
In the first embodiment, an example of a bulb-type lighting device of the present invention will be described.

  FIG. 1 is a cross-sectional view illustrating a schematic configuration of the light bulb-type lighting device of the present embodiment. FIG. 2 is a cross-sectional view showing a detailed configuration of the light emitting module in the light bulb-type lighting device shown in FIG. In FIG. 2, the same components as those in FIG.

  As shown in FIGS. 1 and 2, a light bulb-type lighting device (hereinafter referred to as an LED light bulb) 1 according to this embodiment includes a light emitting module 2 in which a plurality of LEDs 20 are mounted on a substrate 22 as light emitting elements, and a light emitting module 2. A mounting member 3, a case 4 that holds the mounting member 3, a globe 5 that covers the light emitting module 2, a lighting circuit 8 that lights (emits light) the LED 20, and a lighting circuit 8 are stored therein. And the circuit storage member 7 arrange | positioned in the case 4 and the nozzle | cap | die member 6 provided in the end (below case 4 in FIG. 1) of the case 4 are provided.

  The globe 5 is provided in the case 4 so as to cover the light emitting module 2. The globe 5 normally has a function of protecting the light source, but in the present embodiment, it also has a function of adjusting the amount of light from the light emitting module 2 by changing its thickness. The thickness of the globe 5 is adjusted within a range of 0.7 mm to 1.2 mm, for example. Examples of the shape of the globe 5 include a planar shape, a spherical shape, a hemispherical shape, a cylindrical shape, a linear shape, and a shape obtained by combining these. The globe 5 in FIG. 1 has a hemispherical shape (dome shape). Examples of the material of the globe 5 include translucent materials such as glass, acrylic resin, and polycarbonate.

  A diffusion film (not shown) having a thickness corresponding to the chromaticity rank of the light emitting module 2 is provided on the inner surface of the globe 5 (the surface of the globe 5 facing the light emitting module 2). The diffusion film normally has a function of diffusing light emitted from the light source. However, in the present embodiment, the diffusion film also has a function of adjusting the amount of light from the light emitting module 2 by changing its thickness. The film thickness of the diffusion film is adjusted within a range of 10 μm to 200 μm, for example. The diffusion film is composed of inorganic particles such as calcium carbonate, silicon dioxide, aluminum oxide, and titanium oxide. Since the diffusion film is made of an inorganic material, there is almost no deterioration, and even after many years of use, there is little change in characteristics, and reliability can be ensured. The particle size of the inorganic particles constituting the diffusion film is 1.0 μm to 20.0 μm. The diffusion film is not only provided on the inner surface of the globe 5, but a diffusion film may be provided in the globe 5, or inorganic particles may be dispersed in the globe 5.

  The light transmittance of the globe 5 is 85% or more and substantially constant in the first visible light wavelength range of 380 nm or more and 490 nm or less by changing the thickness of the globe 5 or the thickness of the diffusion film, and is 500 nm or more and 700 nm or less. The average value of the light transmittance in the first visible light wavelength range and the light transmittance in the second visible light wavelength range so as to be 90% or more in the visible light wavelength range of 2 and substantially constant. Adjustment is made so that the difference from the average value falls within the range of 2% or more and 12% or less. Therefore, as the thickness of the globe 5 or the thickness of the diffusion film increases, light on the short wavelength side can be absorbed and the light transmittance of the globe 5 in the short wavelength range can be reduced. In particular, when the light transmittance of the globe is adjusted by changing the thickness of the globe 5, the reliability may be affected because the composition may be the same as that of a globe (eg, a glass globe) used in a conventional LED bulb. Does not reach.

  Here, the chromaticity correction effect by changing the thickness of the globe 5 or the diffusion film will be described with reference to FIG. FIG. 7 is a chromaticity diagram illustrating an example of the chromaticity range L0 of the light emission of the light emitting module and the chromaticity range L1 of the illumination light of the LED bulb according to the present embodiment.

  In general, the light emission chromaticity range of the light emitting module 2 (FIG. 1) includes a point indicated by coordinates x = 0.3001, y = 0.3197 and coordinates x = 0.039 as shown in FIG. , Y = 0.3047, a point indicated by coordinates x = 0.301, y = 0.3205, and a point indicated by coordinates x = 0.3186, y = 0.3387 are connected. The chromaticity range L0 represented by the obtained rectangle is obtained. This is a chromaticity range substantially equivalent to the chromaticity range of illumination light of a conventional LED bulb.

  In the present embodiment, the chromaticity rank of the light emitting module 2 can be corrected to a desired chromaticity by combining the globe 5 according to the chromaticity rank of the light emitting module 2 whose light emission chromaticity range is L0. . For example, with respect to the light emitting module 2 in which the chromaticity range of light emission shown in FIG. 7 is L0, the light transmittance of the globe 5 is 85% or more and substantially constant in the first visible light wavelength range of 380 nm to 490 nm. The average value of the light transmittance in the first visible light wavelength range and the second visible light wavelength so as to be 90% or more and substantially constant in the second visible light wavelength range of 500 nm to 700 nm. A glove 5 having a thickness adjusted or a glove 5 having a diffusion film having a thickness adjusted so that the difference from the average value of the light transmittance in the range falls within the range of 2% to 12%. Manufacture LED bulbs. As shown in FIG. 7, the chromaticity range of the illumination light of this LED bulb is based on the point indicated by coordinates x = 0.3100, y = 0.3290, and coordinates x = 0.3125, y = 0.3150. It is represented by a rectangle obtained by connecting the indicated point, the point indicated by coordinates x = 0.3190, y = 0.3220, and the point indicated by coordinates x = 0.3180, y = 0.3360. The chromaticity range L1 can be set. That is, the light of the short wavelength side is absorbed more than the light of the long wavelength side, and the chromaticity range L0 of light emission of the light emitting module 2 is shifted to the upper right in the chromaticity diagram of FIG. Can be reduced to about 50% or less with respect to the chromaticity range of illumination light of a conventional LED bulb.

  Subsequently, a combination of the light emitting module and the globe will be described with reference to FIG. For example, when it is desired to manufacture an LED bulb having a chromaticity range of illumination light L1 using a light emitting module having a chromaticity range of light emission L0, the light emission module having the chromaticity range of light emission belongs to the chromaticity distribution a. Is combined with a globe with a large amount of chromaticity shift, and for a light emitting module belonging to the chromaticity distribution b, a globe with a small amount of chromaticity shift is combined. Thus, by combining gloves according to the chromaticity rank of light emission of the light emitting module 2, the chromaticity range as the light emitting module is L0, but the chromaticity range of the illumination light of the LED bulb may be L1. it can.

  The mounting member 3 mounts the light emitting module 2 and closes the other end of the case 4 (above the case 4 in FIG. 1).

  The case 4 houses a circuit storage member 7 therein, and a lighting circuit 8 is held in the circuit storage member 7.

  The heat generated when the LED 20 is lit is transmitted in order from the substrate 22 of the light emitting module 2 to the mounting member 3 and the case 4, and the heat transmitted to the case 4 is mainly released from the case 4 to the outside air. For this reason, the case 4 has a heat radiating function for radiating heat generated when the LED 20 is lit to the outside air, and can also be referred to as a heat sink. The mounting member 3 transfers heat from the light emitting module 2 to the case 4. It has a function and can be said to be a heat conducting member.

  The base member 6 is attached to a socket of a lamp and receives power from the socket. In FIG. 1, connection lines that electrically connect the lighting circuit 8 and the base member 6 are not shown.

  The circuit storage member 7 stores the lighting circuit 8 therein, and includes a lid 71 and a storage member main body 72.

  The lighting circuit 8 lights the LED 20 using commercial power supplied via the base member 6. The lighting circuit 8 includes electronic components 82 and 83 mounted on a substrate 81, and includes, for example, a rectifying / smoothing circuit and a DC / DC converter.

  As shown in FIG. 2, the light emitting module 2 includes a substrate 22, a plurality of LEDs 20 mounted on the main surface of the substrate 22, and a sealing body 21 that covers the LEDs 20. Note that the number of LEDs 20, the connection method (series connection, parallel connection), and the like are determined by a desired luminous flux required for the LED bulb 1.

  The substrate 22 is made of an insulating material, and a wiring pattern 24 is formed on the main surface of the substrate 22. The wiring pattern 24 includes a connection portion 24 a for connecting the plurality of LEDs 20 by a predetermined connection method, and a terminal portion 24 b electrically connected to the power supply path 9 connected to the lighting circuit 8.

  The LED 20 is a semiconductor light emitting element that emits a predetermined light color. Moreover, the sealing body 21 seals LED20 so that LED20 does not touch external air, for example, a translucent material and the conversion material which converts the wavelength of the light emitted from LED20 into a predetermined wavelength. It consists of.

  For example, a resin material or a ceramic material is used as the substrate 22, but a material having high thermal conductivity is preferable. For the purpose of bulb replacement, for example, a GaN-based LED that emits blue light is used as the LED 20, a silicone resin is used as a translucent material, and a silicate phosphor is used as a conversion material, for example. As a result, white light is emitted from the light emitting module 2.

  The LEDs 20 can be mounted on the substrate 22 so as to be arranged in a matrix. For example, 48 LEDs 20 are mounted in 8 rows × 6 columns, and these LEDs 20 are electrically connected.

  According to the LED bulb of the present embodiment, by using the globe 5 whose light transmittance is adjusted within a predetermined range by changing the thickness of the globe 5 or the thickness of the diffusion film, a decrease in the total luminous flux is suppressed. However, the chromaticity of the illumination light of the LED bulb can be corrected to the design value of the chromaticity of the illumination light of the lamp, and the chromaticity range of the illumination light of the LED bulb is made smaller than the chromaticity range of the illumination light of the lamp. Can do.

(Embodiment 2)
In the second embodiment, the chromaticity correction method of the present invention will be described.

  The chromaticity correction method of the present invention includes, for example, a light emitting module 2 in which a plurality of LEDs 20 are mounted on a substrate 22 shown in FIGS. 1 and 2, a globe 5 made of a translucent material that covers the light emitting module 2, and Is a chromaticity correction method for correcting the chromaticity of the illumination light of the LED bulb 1 provided with the light bulb 2. When the chromaticity of the light emission of the light emitting module 2 does not match the design value of the chromaticity of the illumination light of the lamp, The light transmittance of the globe 5 is adjusted by changing the thickness or the thickness of the diffusion film provided on the inner surface of the globe 5. For example, when at least one of the chromaticity coordinates x and y of light emission of the light emitting module 2 is located on the minus side from the chromaticity coordinates x1 and y1 of the design value of the illumination light of the lamp, the light transmittance of the globe 5 is set. In the first visible light wavelength range, which is the entire range of 380 nm to 490 nm or a part thereof, 85% or more and substantially constant, the entire range of 500 nm to 700 nm or a part thereof. In the visible light wavelength range of 2, the light transmittance is adjusted to be 90% or more and substantially constant, the average value of the light transmittance in the first visible light wavelength range, and the light transmission in the second visible light wavelength range. It adjusts so that the difference with the average value of a rate may be in the range of 2% or more and 12% or less. As a result, the chromaticity of the illumination light can be corrected to the design value of the chromaticity of the lamp illumination light while suppressing the decrease in the total luminous flux, and the chromaticity range of the illumination light is adjusted to the chromaticity of the conventional lamp illumination light. A highly reliable LED bulb that can be made smaller than the range can be realized.

  The chromaticity correction effect of the present invention has been described with reference to FIG.

  Hereinafter, the chromaticity correction method of the LED bulb of the present invention will be described based on examples. However, the following examples do not limit the present invention.

(Glove)
First, a plurality of globes A to D having different light transmittances were prepared. The globes A to D are provided with a diffusion film so as to have a substantially uniform thickness over the entire inner surface of the globe, and the thickness of each diffusion film increases in the order of the globes A, B, C, and D. Glass is used for the globe, and the diffusion film is made of calcium carbonate.

  Here, Table 1 shows the chromaticity and luminous flux ratio of the illumination light of each of the plurality of LED bulbs formed by combining the same light emitting module and the globes A to D. In Table 1, a globeless lamp is an LED bulb that is not covered with a globe. That is, the chromaticity of the illumination light without a globe lamp is the chromaticity of light emission of the light emitting module. The globe A to D lamps are LED bulbs formed by combining the globeless lamps and the globes A to D, and include blue LEDs as light emitting elements. Further, the thickness of the diffusion film provided on the inner surfaces of the globes A to D is adjusted so that the chromaticity coordinates x and y of the illumination light of each lamp have the values shown in Table 1, respectively. The luminous flux ratio is expressed as (luminous luminous flux) / (luminous luminous flux).

  As shown in Table 1, since the chromaticity shift amount increases as the thickness of the diffusion film increases, the chromaticity range of the illumination light of the LED bulb can be shifted according to the thickness of the diffusion film. I understand. However, as the chromaticity shift amount increases, the luminous flux ratio decreases. Therefore, if the thickness of the diffusion film is too large, the light transmittance is reduced and the function as an illumination device cannot be sufficiently achieved. In order to exhibit the function as an illumination device, the luminous flux ratio is preferably 0.90 or more. Therefore, in the case of Table 1 above, the globe D lamp is not suitable as a lighting device, and it can be said that the globe D should not be used.

Next, FIG. 3 shows the chromaticity distribution of the illumination light of the globeless lamps and globe A to D lamps shown in Table 1. In FIG. 3, the horizontal axis x indicates the ratio of Red, and the vertical axis y indicates the ratio of Green. Although not shown in FIG. 3, when the ratio of Blue is z, the relationship of the following formula (1) is established.
x + y + z = 1 (1)

  As shown in FIG. 3, the chromaticity of the illumination light of each lamp in the order of globe A lamp, globe B lamp, globe C lamp, and globe D lamp is in the upper right direction from the position of the chromaticity coordinates of the illumination light of the globeless lamp. Had shifted to. From this, it is considered that the light in the blue wavelength range can be absorbed as the thickness of the diffusion film increases.

  Next, the wavelength spectrum ratio of the light transmittance of the globes A to D shown in Table 1 is shown in FIG. In FIG. 4, the horizontal axis indicates the wavelength (nm), and the vertical axis indicates the spectral ratio to the light transmittance (light transmittance of the lamp with globe / light transmittance of the lamp without globe).

  As shown in FIG. 4, the light transmittance of the globe A lamp and the globe B lamp is about 90% in the first visible light wavelength range of 380 nm to 470 nm, and in the second visible light wavelength range of 500 nm to 700 nm. About 95%. The light transmittance of the globe C lamp was about 85% in the first visible light wavelength range and about 92% in the second visible light wavelength range. The light transmittance of the globe D lamp was about 80% in the first visible light wavelength range and about 88% in the second visible light wavelength range.

  Thus, in any lamp, the light absorption in the first visible light wavelength range of 380 nm to 470 nm, that is, the blue wavelength range, was larger than the light absorption in the other wavelength ranges.

  Here, the relationship between the light transmittance of a glass globe and a wavelength is shown in FIG. When the light transmittance of the glass globe was measured using a certain measurement light source, it was substantially constant at about 90% in the visible light wavelength range of 380 nm to 780 nm. That is, it can be seen from FIG. 5 that the glass globe does not absorb light in a specific wavelength range.

  Therefore, in FIG. 4, the light transmittance in the first visible light wavelength range is smaller than the light transmittance in the second visible light wavelength range, that is, the light in the blue wavelength range is smaller than the light in the other wavelength ranges. The large absorption was considered to be due to the diffusion film.

(Light emitting module)
Next, a plurality of modules 1 to 4 having different light emission chromaticities were prepared. Table 2 shows the chromaticity of the illumination light of the modules 1 to 4. In Table 2, modules 1 to 4 are light emitting modules having different chromaticities due to differences in the amount of phosphor, the wavelength of the chip, and the like.

  FIG. 6 is a diagram showing the chromaticity distribution of light emission of modules 1 to 4 shown in Table 2. In FIG. 6, the design center value indicates the required chromaticity coordinates x1 and y1 of the illumination light of the lamp, and here, x1 = 0.3105 and y1 = 0.3207.

  As shown in FIG. 6, the chromaticity coordinates x and y of the light emission of the modules 1 to 4 are both located on the minus side (lower left in FIG. 6) from the design center values x1 and y1. In order to bring the light emission chromaticity of each module closer to the design center value of the illumination light of the lamp, that is, to shift in the direction of the arrow, it is necessary to combine gloves according to the light emission chromaticity rank of each module as described later. There is.

(Manufacture of LED bulbs)
An LED bulb was manufactured using the globes A to D and the modules 1 to 4. The combination was determined as follows.

  For example, suppose that it is desired to manufacture an LED bulb having chromaticity coordinates of illumination light of x = 0.3105 and y = 0.3207. In the case of the module 1 shown in Table 2, since the chromaticity coordinates are x = 0.0.335 and y = 0.3075, in order to manufacture the LED bulb in the above chromaticity range, x is 0.0070, y is It is necessary to shift by 0.0132. Those having such a chromaticity shift amount are the globe D (the chromaticity shift amounts are Δx = 0.070 and Δy = 0.133) among the globes A to D shown in Table 1, and therefore, this globe D Were combined in module 1.

  In the case of the module 2 shown in Table 2, since the chromaticity coordinates are x = 0.3055 and y = 0.3113, in order to manufacture the LED bulb in the above chromaticity range, x is 0.0050, y is It is necessary to shift by 0.0094. Therefore, the module 2 was combined with a globe C having chromaticity shift amounts Δx = 0.050 and Δy = 0.0004.

  In the case of the module 3 shown in Table 2, since the chromaticity coordinates are x = 0.3069 and y = 0.137, in order to manufacture the LED bulb in the above chromaticity range, x is 0.0036, y is It is necessary to shift by 0.0070. Therefore, the module 3 was combined with a globe B having chromaticity shift amounts Δx = 0.636 and Δy = 0.070.

  In the case of the module 4 shown in Table 2, since the chromaticity coordinates are x = 0.3079 and y = 0.3157, in order to manufacture the LED bulb in the above chromaticity range, x is 0.0026, y is It is necessary to shift by 0.0050. Therefore, the module 4 was combined with a globe A having chromaticity shift amounts of Δx = 0.026 and Δy = 0.050.

  Thus, the LED bulb | ball which emits the illumination light of desired chromaticity can be manufactured by combining the glove | globe corresponding to the chromaticity rank of a light emitting module. However, as described above, when the globe D shown in Table 1 is used, the luminous flux ratio is as low as 0.85. Therefore, an LED bulb combining the module 1 and the globe D is not suitable as a lighting device.

  The light bulb-type lighting device of the present invention can correct the chromaticity of the illumination light to a desired chromaticity while suppressing the decrease in the total luminous flux, and the chromaticity range of the illumination light is the color of the illumination light of the conventional lamp. It can be used as an alternative to incandescent bulbs that can be made smaller than the temperature range.

1 LED bulb 2 Light emitting module 20 LED
DESCRIPTION OF SYMBOLS 21 Sealing body 22 Board | substrate 24 Wiring pattern 24a Connection part 24b Terminal part 3 Mounting member 4 Case 5 Globe 6 Base member 7 Circuit storage member 71 Cover body 72 Storage member main body 8 Lighting circuit 81 Substrate 82 Electronic component 83 Electronic component 9 Power feeding Road

Claims (7)

A light emitting module in which a plurality of light emitting elements are mounted on a substrate;
A glove made of a translucent material covering the light emitting module,
The globe corrects the light emission chromaticity of the light emitting module to the design value of the chromaticity of the illumination light of the lamp by adjusting the light transmittance of the globe ,
Emission chromaticity coordinates x of the light emitting module, at least one of y is, when located on the minus side from the chromaticity coordinates x1, y1 of the design value of the illumination light of the lamp, the light transmittance of the globe, the By changing the thickness of the globe or the thickness of the diffusion film provided on the inner surface of the globe, it is 85% or more in the first visible light wavelength range that is the entire range of 380 nm to 490 nm or a part thereof, and substantially The first visible light wavelength range is constant and is adjusted to be 90% or more and substantially constant in the second visible light wavelength range which is the entire range of 500 nm to 700 nm or a part thereof. And the difference between the average value of the light transmittance in the second visible light wavelength range and the average value of the light transmittance in the second visible light wavelength range is adjusted to be in the range of 2% to 12%. A light bulb-type lighting device. The light transmittance in the first visible light wavelength range is 90% or more;
The light bulb shaped illumination device according to claim 1, wherein the light transmittance in the second visible light wavelength range is 95% or more.   The light-bulb illuminating device according to claim 1, wherein the translucent material is any one of glass, acrylic resin, and polycarbonate.   The light bulb-type lighting device according to any one of claims 1 to 3, wherein a diffusion film is provided on an inner surface of the globe.   The bulb-type lighting device according to claim 4, wherein the diffusion film is made of any one of calcium carbonate, silicon dioxide, aluminum oxide, and titanium oxide.   The light emitting element according to claim 1, wherein the light emitting element emits blue light. A chromaticity correction method for correcting the chromaticity of illumination light of a light bulb-type illumination device, comprising: a light-emitting module having a plurality of light-emitting elements mounted on a substrate; and a globe made of a translucent material that covers the light-emitting module. ,
When at least one of the chromaticity coordinates x, y of the light emission of the light emitting module is located on the minus side from the chromaticity coordinates x1, y1 of the design value of the illumination light of the lamp, the thickness of the globe or the inner surface of the globe The light transmittance of the globe is 85% or more in the first visible light wavelength range which is the entire range of 380 nm or more and 490 nm or less or a part thereof, by changing the thickness of the diffusion film provided on the substrate. In the second visible light wavelength range, which is constant, the entire range from 500 nm to 700 nm or a part thereof, the first visible light wavelength range is adjusted to be 90% or more and substantially constant. So that the difference between the average value of the light transmittance at and the average value of the light transmittance in the second visible light wavelength range is in the range of 2% to 12%. , Chromaticity correction method characterized in that the chromaticity of the illumination light of the bulb-shaped lighting device is corrected to the design value of the chromaticity of the illumination light of the lamp.

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